18253+4846 HU 66 AB

Coord 2000	18253+4846		Discov num	HU   66		Comp	AB		Coord arcsec 2000	18 25 18.20 +48 45 42.5
Date first	1883		Date last	2016		Obs	65
Pa first	24		Pa last	197.3		P.A. Now (θ)	197.3°
Sep first	0.5		Sep last	0.203		Sep. Now (ρ)	0.203"
Mag pri	7.90		Mag sec	8.40		delta mag (ΔM)	0.5		Spectral class	G5 (yellow)
Pri motion ra	+024		Sec motion ra
Pri motion dec	+003		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		47482	18 25 18 +48 45 42	HU 66 AB	2016	65	197	0.2	7.90	8.40	0.50	Y	<===
Show	HD 170109	47482	18 25 18 +48 45 42	STT 351 AC	2021	102	26	1.0	7.90	8.25	0.35	Y
Show			18 25 18 +48 45 42	HU 66 BC	2019	20	26	0.8	8.40	8.25	0.15	Y

Triple system
3 estimated visually detectable stars in this system

Constellation	Draco		SAO	47482		HIP	90284		Tycho2	3534-00302-1
Gaia DR2	2123486226905640960		HD	170109		GC	25163		ADS	11344
BD	BD+48 2692		Distance	144.72		Distance ly	472.08

Period (P)	300y		Periastron (T)	2022y		Semi-major axis (a)	0.392a
Eccentricity (e)	0.546		Inclination (i)	123.2°		Longitude of periastron (ω)	269.6°
Node (Ω)	59.7°		Notes	n		Reference	USN2002
Equinox	2000		Last observation	1995		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 235.6 0.255 2001 234.3 0.248 2002 232.9 0.242 2003 231.4 0.235 2004 229.8 0.227 2005 228.1 0.220 2006 226.3 0.212 2007 224.3 0.204 2008 222.2 0.196 2009 219.9 0.188 2010 217.4 0.179 2011 214.6 0.170 2012 211.5 0.161 2013 208.1 0.152 2014 204.2 0.143 2015 199.8 0.135 2016 194.8 0.126 2017 189.2 0.119 2018 182.8 0.112 2019 175.7 0.106 2020 167.8 0.101 2021 159.3 0.099 2022 150.4 0.097 2023 141.6 0.098 2024 133.0 0.101 2025 125.0 0.105 2026 117.8 0.111 2027 111.3 0.118 2028 105.5 0.125 2029 100.5 0.134 2030 96.0 0.142		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic